frostruan commented on PR #5408:
URL: https://github.com/apache/hbase/pull/5408#issuecomment-3258647962

   Oh, thanks for the reminder, this is indeed better. Let me address.
   
   One more word, even we move collecting regionserver wal filenum from client 
to master, RSRpcService still needs to provide an interface for the master to 
query the latest filenum. When implementing SnapshotProcedure before, I had 
thought about changing the signature of **RSProcedureCallable** from `public 
interface RSProcedureCallable extends Callable<Void>` to `public interface 
RSProcedureCallable<T> extends Callable<T>`, where type T is the information 
that can be returned to the Master after RSProcedureCallable is completed. 
However, considering that the Void type is enough for most 
RSProcedureCallables, we can consider this change in a later version.


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